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To view the ip helper-address configuration for an interface, use the show ip interface command
from EXEC privilege mode.
Example of the show ip interface Command
R1_E600#show ip int gig 1/3
GigabitEthernet 1/3 is up, line protocol is down
Internet address is 10.11.0.1/24
Broadcast address is 10.11.0.255
Address determined by user input
IP MTU is 1500 bytes
Helper address is 192.168.0.1
Directed broadcast forwarding is disabled
Proxy ARP is enabled
Split Horizon is enabled
Poison Reverse is disabled
ICMP redirects are not sent
ICMP unreachables are not sent
Configure the System to be a DHCP
Client
A DHCP client is a network device that requests an IP address and configuration parameters from a DHCP
server.
Implement the DHCP client functionality as follows:
•
The switch can obtain a dynamically assigned IP address from a DHCP server. A start-up configuration is
not received. Use bare metal provisioning (BMP) to receive configuration parameters (OS version and a
configuration file). BMP is enabled as a factory-default setting on a switch.
A switch cannot operate with BMP and as a DHCP client simultaneously. To disable BMP in EXEC mode,
use the stop bmp command. After BMP stops, the switch acts as a DHCP client.
•
Acquire a dynamic IP address from a DHCP client is for a limited period or until the client releases the
address.
•
A DHCP server manages and assigns IP addresses to clients from an address pool stored on the server.
For more information, refer to
•
Dynamically assigned IP addresses are supported on 10-Gigabit and 40-Gigabit interfaces. The DHCP
client is supported on VLAN and port-channel interfaces.
•
The public out-of-band management interface and default VLAN 1 are configured by default as a DHCP
client to acquire a dynamic IP address from a DHCP server.
DHCP Client on a Management Interface
These conditions apply when you enable a management interface to operate as a DHCP client.
•
The management default route is added with the gateway as the router IP address received in the DHCP
ACK packet. It is required to send and receive traffic to and from other subnets on the external network.
The route is added irrespective when the DHCP client and server are in the same or different subnets.
The management default route is deleted if the management IP address is released like other DHCP
client management routes.
192.168.0.2
Configuring the Server for Automatic Address Allocation.
Dynamic Host Configuration Protocol (DHCP)
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Troubleshooting
